3. Two coaxial conducting cylindrical shells have equal and opposite charges. The inner shell has charge +g and an inner radius a, and the outer shell has charge-q and an outer radius b. The length of each cylindrical shell is L, and L is very long compared with b. Find the potential difference, Va – Vb between the shells.

3. Two coaxial conducting cylindrical shells have equal and opposite charges. The inner shell has charge +g and an inner radius a, and the outer shell has charge-q and an outer radius b. The length of each cylindrical shell is L, and L is very long compared with b. Find the potential difference, Va – Vb between the shells.